in the conditions in which terrorist attacks on facilities and civilian places increase more and more attention to design of structures against impact loads of explosion is more important and needs special considerations. study of nature of blast loads and methods of applying it on the structure is one of the important problems. explosion is a sudden and rapid release of a great amount of energ...

The presence of gas hydrate and associated gas in the Makran Accretionary Prism, offshore Iran, has been confirmed by various seismic indicators, including the bottom-simulating reflector (BSR), amplitude blanking, and bright spot. The pre-stack analysis and the study of amplitude-variation-with-offset (AVO) attributes are the most reliable tools for semi-quantitative study of gas hydrate and f...

Detection of subsurface structures by means of gravity method can be used to determine mass distribution and density contrast of rock units. This distribution could be detected by different geophysical methods, especially gravity method. However, gravity techniques have some drawbacks and can't be always successful in distinguishing subsurface structures. Performance of the gravity technique co...

Rock physical model and amplitude variation with offset (AVO) patterns considering the content of organic matter composition minerals have a wider significance for guiding identification prediction mud-rich source rock. A rock is proposed describing elastic properties kerogen in different maturity stages. The builds an intrinsic connection between parameters rock, thereby providing theoretical ...

Azimuthally-dependent P-wave AVO (amplitude variation with offset) responses can be related to open fracture orientation and have been suggested as a geophysical tool to identify fracture orientation in fractured oil and gas reservoirs. A field experiment recently conducted over a fractured reservoir in the Barinas Basin (Venezuela) provides data for an excellent test of this approach. Three li...

SUMMARY Seismic inversion of amplitude versus offset (AVO) data in viscoelastic media can potentially provide high-resolution subsurface models seismic velocities and attenuation from offset/angle gathers. P- S-wave quality factors (Q), whose inverse represent a measure attenuation, depend on reservoir rock pore fluid properties, particular, saturation, permeability, porosity, viscosity litholo...

We estimate shear-wave velocities in the shallow subsurface throughout Japan by applying seismic interferometry to the data recorded with KiK-net, a strongmotion network in Japan. Each KiK-net station has two receivers; one receiver on the surface and the other in a borehole. By using seismic interferometry, we extract the shear wave that propagates between these two receivers. Applying this me...

Abstract The fracture direction and its intensity are critical properties related to hydrocarbon characterization identification. Both these have an essential role in identifying the of migration, determining sweet spot area, optimizing drilling design. velocity variation with azimuth (VVAz) is a well-known method estimate intensity. This widespread interest because it predicts based on seismic...